Update bioconda-recipe to support osx-arm64

[isaacovercast]

<You might recognize this issue from the cutadapt repo ;p>

The bioconda folks recently rolled out support for osx-arm64 builds (Mac M1/M2). Enabling the build for this platform is currently 'opt-in' so you have to add a flag to the meta.yaml (documented at the link). I have updated my own package following this direction and it works fine.

[marcelm]

Yes! Let’s continue discussion on the Cutadapt issue or on the Bioconda tracker; I’ll close this issue.